joerd

Nextzen has freely available DEM tile data to zoom level 15, so about 5 meters/pixel. You need a free API key [1] Mapbox has paid DEM data to zoom level 20, but I think it's just zoom level 15 scaled up (but the data is cleaner and more recent) [2] Nextzen also open-sourced their elevation tile generator, but I haven't tried to generate my own tiles [3] [1] https://www.nextzen.org/#terrain-tiles [2] https://docs.mapbox.com/help/troubleshooting/access-elevatio... [3] https://github.com/tilezen/joerd

This is the best option for free terrain tiles. There are four formats, though "Terrarium" is the most used. It maps RGB pixels in a PNG to raw elevation values using this formula [0]. If you're using Mapbox GL, you can just point your map to [1] to fetch the tiles, and then use it as a hillshade. I do that in my topographic map style [2]. [0]: https://github.com/tilezen/joerd/blob/master/docs/formats.md... [1]: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/... [2]: https://nst-guide.github.io/osm-liberty-topo/

It'd be great to have this data in Internet Archive. If you check out our GitHub repo [0] you can see where we coordinate finding data sources. The data I download gets composited into tiles for display on maps, so we're updating ~4 billion objects in S3. The source data is probably the better thing to include in IA, and the GitHub repo is probably the best place to find how to mirror it. If you've got time to spend on it, you might post an issue in there and I can help point you in the right direction. [0] https://github.com/tilezen/joerd/issues?q=is%3Aissue+is%3Aop...